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5g of NaOH ar...

Question

5g of NaOH are dissolved in 500 ml water. Find the molarity of the solution.

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Solution

The molecular weight of $N a O H$ is 40 g/mol.
The number of moles of $N a O H$ $\frac{5 g}{40 g/mol} = 0.125$ moles.
$500$ ml water corresponds to $0.500$ L.
The molarity of the solution $= \frac{0.125 moles}{0.500 L} = 0.25$ M

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